Seasonal variation in atmospheric deposition of nitrate, sulphate, lead, zinc, and copper in southwestern Nigeria

被引:7
|
作者
Adetunji, MT
Martins, O
Arowolo, TA
机构
[1] Univ Agr, Dept Soil Sci & Agr Mechanizat, Abeokuta, Ogun State, Nigeria
[2] Univ Agr, Dept Agro Meteorol & Water Management, Abeokuta, Ogun State, Nigeria
[3] Univ Agr, Dept Environm Management & Toxicol, Abeokuta, Ogun State, Nigeria
关键词
D O I
10.1081/CSS-100102993
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Atmospheric and soil levels of nitrate-nitrogen (NO3-N), sulphate (SO,), lead (Pb), zinc (Zn), and copper (Cu) in southwestern Nigeria were determined. Rainfall and dust samples were collected at 2-week intervals and after a major rainfall and dust storm events at eight locations in a transect from the coast in Badagry to Ilorin, 300 km from the coast. The parameters were evaluated on monthly, seasonal, and annual bases for 2 years. The pH of the deposited materials varied with season and distance from the coast. Higher values were obtained in the dry season and in the hinterland. Soil pH followed a similar trend. The average annual depositions of NO3-N, SO4, Ph, Zn, and Cu ranged from 4.05 to 6.60, 2.58-5.85, 0.60-2.76, 0.96-2.52, and 0.39-2.79 kg ha(-1), respectively. Correspondingly the values in soil ranged from 7.45 to 15.65, 3.15-9.50, 1.65-3.35, 1.65-2.80, and 1.75-3.70 kg ha(-1). The values also varied with season. Relationships between deposited ph and Cu and soil values were significant. It was: concluded that harmattan dust and/or motorized traffic do contribute significantly to the soil levels of Pb and Cu and less significantly to the levels of pH, NO3-N, SO4, and Zn in the soil.
引用
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页码:65 / 73
页数:9
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